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Contractors World UK Ireland Vol 6 No 2

31

Next Generation Roofing Solution

For Low-

Energy Homes

An innovative prefabricated roof system that en-

ables the installation of a fully insulated pitched

roof in just a matter of hours, has been specified

and installed at an eco-house in one of Britain’s

top tourist locations.

Created by PIR manufacturer Recticel Insulation,

L-Ments, is a self-supporting system enabling a

safe, fast method of creating a watertight

structure.

The detached, four-bedroom home located in

Burley, the heart of Hampshire’s glorious New Forest,

has been designed and built by architect, Nick Lacey. For

the two-storey property - constructed using Passive and

Active solar techniques - Mr Lacey required solutions

that would offer fast, quality construction along with

high performance.

For the roof L-Ments met this brief, providing a pre-

fabricated system with superb thermal performance

that quickly waterproofed the partially-built home and

helped to speed-up the construction process. Such was

the ease of application the construction of the pitched

roof was completed in just seven hours.

Mr Lacey commented:

“The roof’s prefabricated element was key to its

specification as I urgently needed to speed-up

building works on this project. I’m glad to say I

made the right decision. L-Ments is built for rapid

installation as well as containing all the

necessary thermal properties to ensure the

completed house meets the near- zero carbon

standard. Working with the system proved to be

a very good choice.”

The 200 m² Burley house is the first project to use

the innovative system in the UK.

Designed to offer U-values of between 0.13 and 0.19

W/m²K, it comprises, breather membrane, counter bat-

tens and integral structural timber along with high

performance PIR insulation, all incorporated into light-

weight cost-effective modular roofing panels.

To create a total roof solution, the vapour permeable

underlay felt is pre-glued with self-adhesive overlaps.

Counter battens are fixed to the panel while the mul-

ti-layered facings act as a vapour and air barrier on the

inside.

The PIR insulation core offers low thermal conduc-

tivity at 0.023 W/mK, and the timber rafters incorporated

within the core offer strength for self-support. During

the production process, the foaming takes place around

the rafters which means that the panels are completely

airtight as well as highly vapour resistant. The L-Ments

system can be covered with a range of finishes such as

tiles, slates and zinc.

Available in four thicknesses and five lengths, 195 m²

of 200 mm thick x 1200 mm x 6500 mm panels were

used in the Burley pitched-roof’s construction. The pan-

els, which feature shiplap joints to ensure they lock

together and are lifted into position via a crane, were

easily adapted to address the roof’s pitch of 60° on the

north-side and 30° on the south-side.

The Burley project is due for completion in December

2016.

Recticel Insulation